Hello Scott
Thank you!
Yes they are the same, entry number 6 was made to provide different file formats to maximize software compatibility.
I believe that the whoever does the fabrication whether using 3d printing or even using asymmetric molding process can create the product.
I aimed to design the ball so that it is simple and does not have any difficult areas or slopes that would not be compatible with 3d printing.
I have not worked with spongy materials used in 3D printers before, so i made sure the design will not cause problems, as i did for the other entries.
I also aimed to have not to thin walls, as they would brake in time... being a spongy material.

I am always available for more clarifications and eventual modifications.
Kindest regards.
Peter

It looks to me like your designs numbered 5 & 6 are the same. With showing the inside. I like this design the most. Can I produce the ball with a spongy material and still have a hollow inside section so that the ball rolls crooked?